Camera device and method for detecting an object

ABSTRACT

A camera device is provided that comprises a camera having an image sensor for recording images of the objects and at least one first deflection element, and wherein the field of view of the camera has at least one first part field of vision with detection of the first deflection element and a second part field of vision with detection of the first deflection element. In this respect, the first deflection element is arranged such that a first perspective of the first part field of vision is a different one than a second perspective of the second part field of vision; the first part field of vision thus provides a different perspective of the object than the first part field of vision so that at least two sides of the object are simultaneously recorded by the image sensor.

The invention relates to a camera device and to a method for detectingan object in a stream of objects moved in a longitudinal directionrelative to the camera device.

Cameras are used in a variety of ways in industrial applications toautomatically detect object properties, for example for the inspectionor for the measurement of objects. In this respect, images of the objectare recorded and are evaluated in accordance without the task by imageprocessing methods. An important use of cameras is the reading of codes.Objects with the codes located thereon are detected with the aid of animage sensor and the code regions are identified in the images and thendecoded. Camera-based code readers also cope without problem withdifferent code types than one-dimensional barcodes which also have atwo-dimensional structure like a matrix code and provide moreinformation. Typical areas of use of code readers are supermarket cashregisters, automatic parcel identification, sorting of mail shipments,baggage handling at airports, and other logistic applications.

A frequent detection situation is the installation of the camera above aconveyor belt. The camera records images during the relative movement ofthe object stream on the conveyor belt and instigates further processingsteps in dependence on the object properties acquired. Such processingsteps comprise, for example, the further processing adapted to thespecific object at a machine which acts on the conveyed objects or achange to the object stream in that specific objects are expelled fromthe object stream within the framework of a quality control or theobject stream is sorted into a plurality of partial object streams. Ifthe camera is a camera-based code reader, the objects are identifiedwith reference to the affixed codes for a correct sorting or for similarprocessing steps. As a rule, the conveying system continuously deliverspath-related pulses by an incremental encoder so that the objectpositions are known at all times, even with a changing conveying speed.

The image sensor of the camera can be configured as a line or as amatrix. The movement of the object to be sensed is used to successivelyassemble an image in that lines are arranged in a row or in thatindividual images are combined. In this respect, only one object sidecan always be detected from the respective perspective of the camera andan additional camera has to be used for every further reading side.

FIG. 9 shows a conventional installation where a camera 100 records anobject 104 located on a conveyor belt 102 with its field of vision 106from above, in a so-called top reading. Additional cameras 100 a-bhaving corresponding fields of vision 106 a-b installed beside theconveyor belt 102 are required for a side reading. FIG. 10 shows analternative installation for a top reading using a deflection mirror108. A more compact construction of the reading tunnel with a camera 100attached more closely is possible in this manner. However, this does notchange the fact that the camera 100 can only detect a single object sideand two additional cameras would be required for a side reading.

It is conceivable to orient the camera such that two sides of the objectcan be detected after one another in the course of the conveyingmovement. In U.S. Pat. No. 6,484,066 B1, one camera observes the frontsurface and a side surface from a correspondingly oblique perspectiveand a second camera observes the rear surface and the other sidesurface. Respective mirrors extends the light path in a smallconstruction space in accordance with the principle of FIG. 10 explainedabove. The oblique perspective results in distortion, however, that hasto be compensated and that reduces the image quality.

DE 20 2013 009 198 U1 discloses a device for deflecting and for wideningthe field of vision of a camera. In this respect, a wider field ofvision is recorded by mirrors correspondingly tilted with respect to oneanother in that part zones disposed next to one another are imaged overone another on the image sensor. An alternative mirror arrangement for acorresponding field of vision widening is presented in EP 2 624 042 A2.However, in both cases the fact of only a single perspective on theobject is maintained; a plurality of camera still have to be used for adetection of a plurality of sides.

EP 0 258 810 A2 deals with the inspection of articles. Five or six sidesare detectable with the same camera through a plurality of mirrors. Thelarge number of mirrors results in a high adjustment effort and does notwork with a line scan camera and the resolution accordingly remainslimited for code reading, with code reading also not being a provideduse. A whole group of illumination units is arranged around the articlefor the illumination. A detection of an object from a plurality of sidesby a mirror arrangement is also known from U.S. Pat. No. 2,010,226 114A1, with the comparable disadvantages being accompanied by the fact thatno movement of the object is provided here.

Staggered mirrors are used in EP 2 937 810 A1 to effectively record anobject multiple times at different distances. The object is therebylocated in the light path via at least one of the mirrors in the depthof field range. In an embodiment, the mirrors are used to detect thefront side, upper side, or rear side depending on the conveyingposition. A simultaneous detection of an object from a plurality ofperspectives is, however, not possible in this manner and the sidesurfaces could still only be recorded using additional cameras.

US 2010/0163622 A1 uses a monolithic mirror structure in an optical codereader to spread the field of view of the image sensor over a pluralityof different views. This mirror structure is complex and inflexible.

It is therefore the object of the invention to achieve an improveddetection of objects moved in a stream.

This object is satisfied by a camera device and by a method fordetecting an object in a stream of objects moved in a longitudinaldirection relative to the camera device in accordance with therespective independent claim. A camera of the camera device recordsimages of objects with an image sensor, said objects forming a stream ofobjects that is located in a relative movement to the camera in alongitudinal direction. At least one first deflection element provides afolding of the optical reception path for the image recording. The fieldof view of the camera is divided into at least one first part field ofvision with detection of the first deflection element and a second partfield of vision without detection of the first deflection element. Inother words, the first deflection element can be seen in the first partfield of vision and not in the second field of vision. More than twopart fields of vision having different configurations of individualdeflection elements or a plurality of deflection elements after oneanother can generally also be provided. It is conceivable that a partfield of vision records the object completely without deflection andconsequently directly. The part fields of vision are preferablydisjunctive with respect to one another and thus correspond to differentpixels and/or together form the total field of view of the image sensoror of the camera so that then all the pixels of the image sensor areutilized.

The invention starts from the basic idea of an expansion of the field ofview of the camera by a different folding of the optical path, andindeed such that different perspectives of the object are producedbeyond the original perspective. The first deflection element providesan additional perspective of the object in that it provides a fold atall in the first part field of vision and at least a different fold thanin the second part field of vision. The recording of the objects from aplurality of perspectives using the same camera is thereby madepossible. This recording takes place simultaneously from the differentperspectives; differently, for example, than in EP 2 937 810 A1, wherethe front surface, upper surface, and rear surface can only be detectedafter one another in different conveying positions. The perspectives aremoreover largely freely selectable, including a side detection.

This description is driven at many points by the idea of at leastlargely parallelepiped-shaped objects that have six sides or surfaces.This is also a frequent application, but the invention is not restrictedto it, particularly since there are equally the corresponding sixperspectives with objects of any desired geometry.

The invention has the advantage that a detection of a plurality of sidesbecomes possible with fewer cameras. The reduced number of camerareduces the costs and the complexity and enables a smaller and morecompact mechanical system design. In this respect, the increasinglyavailable high resolution of image sensors is used sensibly and as fullyas possible.

The second perspective is preferably a plan view. The stream of objectsis thus detected from above from the second perspective and the upperside of the objects is recorded; also called top reading with a codereader. The camera is in this respect preferably also installed abovethe stream. It is either itself downwardly oriented or the secondperspective from above is provided by corresponding deflection elements.The first deflection element is not involved, it is outside the secondpart field of vision.

The first perspective is preferably a side view from a transversedirection transversely, in particular perpendicular, to the longitudinaldirection. The first perspective, a lateral perspective in thisembodiment, is produced by the deflection of the first deflectionelement. An object side is thus additionally detected, for example inaddition to the upper side from the second perspective, with the secondperspective alternatively also being able to record a first surface or arear surface.

The camera device preferably comprises a second deflection element; thefield of view of the camera has a third part field of vision withdetection of the second deflection element and the second deflectionelement is arranged such that a third perspective of the third partfield of vision is different than the first perspective and the secondperspective so that three sides of the object can be simultaneouslyrecorded by the image sensor. Analogously to the first perspective bythe first deflection element, yet a third perspective is thus producedwith a third part field of vision and a second deflection element. Thesecond deflection element is accordingly detected exactly in the thirdpart field of vision, accordingly not in the other part fields ofvision, and the first deflection element not in the third part field ofvision. The third perspective Is particularly preferably a side viewfrom an opposite direction to the first perspective. Both sides of theobject are thus recorded from the first and third perspectives, inaddition to the second perspective of the upper side, for example.

The camera is preferably installed as stationary at a conveying devicewhich conveys the stream of objects in the longitudinal direction. Apreferred installation position is above the conveyor belt to thuscombine a detection from above with the detection of one or more furthersides, in particular with a lateral detection. Other installationpositions are, however, also conceivable to combine other perspectives.If the lower side is to be detected, arrangements have to be made at theconveying device such as an inspection window.

The camera device preferably has a third deflection element that isarranged such that it is detected in the second part field of vision.The optical reception path is also folded in the second part field ofvision or in the second perspective. An example is the orientation ofthe camera not directly toward the object, for instance a shallowdirection of gaze at least approximately in parallel with orantiparallel to the longitudinal direction with a deflection onto theobject from above or from a side. It is conceivable to fold the opticalpath of the second perspective multiple times by further deflectionelements.

The camera device preferably has a fourth deflection element that onceagain folds the optical reception path of the first perspective foldedby the first deflection element. The deflection for the firstperspective accordingly has two or more stages, for example first from acamera installed above next to the stream and then on the object. The atleast double deflection permits a detection of the object at leastalmost perpendicular to its surface to be recorded, in particular a sidesurface, in addition to a particularly compact design.

The camera device preferably has a fifth deflection element that onceagain folds the optical reception path of the third perspective foldedby the second deflection element. The function of the fifth deflectionelement for the third perspective corresponds to that of the fourthdeflection element for the first perspective.

The deflection elements are preferably arranged such that the lightpaths between the camera and the object are of the same length for thedifferent perspectives with a tolerance corresponding to a depth offield range of the camera. Focused images are thereby recorded in allperspectives. An implementation option comprises affixing the thirddeflection element at a greater distance from the camera than the firstor second deflection element. The light path in the second perspectiveis ultimately thereby artificially extended to compensate the diversionthat is required in the first or third perspective. It thereby becomespossible that the light path from the camera via the third deflectionelement to the object, for example to its upper side, is approximatelythe same length as that from the camera via the first deflection elementand the fourth deflection element to the object, for example its sidesurface, or correspondingly from the camera via the second deflectionelement and the fifth deflection element to the object, for example toits other side surface.

The respective deflection elements preferably have a mirror and a holderfor installation in a specified arrangement and orientation with respectto the stream of objects. Due to their own holders and as separatecomponents, the deflection elements can be positioned and orientedlargely optionally in space, completely differently than, for example,with a monolithic mirror structure in accordance with US 2010/0163622 A1named in the introduction. The mirrors can satisfy further opticalfunctions, for instance by curved mirror surfaces having bundling orscattering properties or can be provided with filtering properties forspecific spectra by coatings and the like.

The image sensor is preferably configured as a linear sensor, however.Such linear sensors are available with very high pixel resolutions thatare actually no longer absolutely necessary in part for the detection ofa single object side. In accordance with the invention, the additionalpixels can be used to record additional sides from additionalperspectives.

Pixel regions of the image sensor disposed next to one anotherpreferably correspond to the part fields of vision, in particular acentral pixel region to the second part field of vision and a side pixelregion to the first or further part fields of vision. The width of thefield of vision is then preferably greater than that of the stream ofobjects to be detected or of the conveyor belt and a lateral excess isadvantageously used at one side or at both sides for a furtherperspective or for two further perspectives.

Alternatively, pixel regions of the image sensor disposed above oneanother correspond to the part fields of vision. In this case, the imagesensor is a matrix sensor whose linear sections disposed above oneanother are used for the different perspectives. For this purpose, thedeflection elements are preferably formed with a plurality ofcorrespondingly tilted sections or additional deflection elements areused to arrange the part fields of vision suitably on the matrix sensor.

The camera device preferably has an illumination unit to illuminate thefield of view of the camera, in particular the part fields of vision viathe respective deflection elements. If the illumination unit likewiseuses the deflection elements, a single central illumination unit issufficient, wholly analogously to a single image sensor that can recordfrom a plurality of perspectives in accordance with the invention.

The camera device preferably has a control and evaluation unit that isconfigured to localize code regions in the image data detected by theimage sensor and to read their code content. Code contents can bedetected in a further sense as in the reading of texts (OCR, opticalcharacter reading) or the recognizing of symbols. A camera-based codereader is, however, particularly preferably meant that reads opticalbarcodes and optical 2D codes and that does this with a single cameraand a single image sensor from a plurality of object sidessimultaneously.

The method in accordance with the invention can be further developed ina similar manner and shows similar advantages in so doing. Suchadvantageous features are described in an exemplary, but not exclusivemanner in the subordinate claims dependent on the independent claims.

The invention will be explained in more detail in the following alsowith respect to further features and advantages by way of example withreference to embodiments and to the enclosed drawing. The Figures of thedrawing show in:

FIG. 1: a schematic view of a camera installed at a conveyor belt withobjects to be detected;

FIG. 2 a three-dimensional view of a camera device with folded opticalpaths for a simultaneous detection from above and from one side;

FIG. 3 a front view of the camera device in accordance with FIG. 2;

FIG. 4 a plan view of the camera device in accordance with FIG. 2;

FIG. 5 a dissection of the light paths in FIG. 2 to explain how theobject can be held by light paths of equal length for all theperspectives in the depth of field range;

FIG. 6 a three-dimensional view of a camera device with folded opticalpaths for a simultaneous detection from above and from both sides;

FIG. 7 a front view of the camera device in accordance with FIG. 6;

FIG. 8 a plan view of the camera device in accordance with FIG. 6;

FIG. 9 a representation of a conventional camera device that requiresthree cameras for the detection of three sides; and

FIG. 10 a representation of a further conventional camera device thatdetects an object from above with the aid of a mirror with a horizontalorientation.

FIG. 1 shows a camera 10 that is mounted above a conveyor belt 12 onwhich objects 14 are conveyed through a field of vision 18 of the camera10 in a conveying direction 16 indicated by arrows. The objects 14 bearcodes 20 that are read by the camera 10 at their outer surfaces in apreferred embodiment. For this purpose, the camera 10 records images ofthe respective objects 14 located in the field of vision 19 via areception optics 22 using an image sensor 24.

An evaluation unit 26 comprises a decoding unit that evaluates theimages. In this respect, code regions are identified and the codecontents of the codes 20 are read. The evaluation function can also beimplemented at least partially outside the camera 10. The camera 10 isonly preferably configured as a camera-based code reader. In addition tothe reading of optically 1 D or 2D codes, further possible imageprocessing work includes the recognition of symbols, in particularHazmat labels, the reading of characters (OCR, optical characterreading), in particular of addresses, and further processing.

The camera 10 can be configured as a line scan camera having a linearimage sensor 24 of preferably a high resolution of, for example, eightthousand or twelve thousand pixels. Alternatively, the image sensor 24is a matrix sensor that can have a total comparable resolution overallof four, eight, or twelve megapixels. However, they are distributed overthe surface so that a successive image recording with a line in thecourse of the conveying movement can result in substantially more highlyresolved images. In some applications, in particular when using imageprocessing on the basis of machine learning or CNNs (convolutionalneural networks), a smaller pixel resolution is also sufficient. Astatic image recording without a moved object stream or a conveyor belt12 is generally also conceivable with a matrix sensor. Conversely, it isoften sensible also to combine the images recorded by a matrix sensorsuccessively to a larger image in the course of a conveying movement.

Further sensors that are shown as representative by a feed sensor 28,for example an incremental encoder, by which the speed or the feed ofthe conveyor belt 12 is determined, can belong to a reading tunnelformed by a camera 10 and a conveyor belt 12. Information that isdetected at some point along the conveyor belt 12 can thereby beconverted at different positions along the conveyor belt 12, or, whichis of equal value thanks to the known feed, at different times. Furtherconceivable sensors are a trigger light barrier that respectivelyrecognizes the entry of an object 14 into the field of vision 18 or ageometric sensor, in particular a laser scanner, that detects a 3Dcontour of the objects 14 on the conveyor belt 12.

The field of vision 18 of the camera 10 is divided by deflectionelements 30 a-c, in particular mirrors, and the respective opticalreception path 32 a-b is correspondingly folded. This will become moreeasily recognizable and will be explained in more detail with referenceto FIGS. 2 to 8. Deflection elements 30 a, 30 b provide that the opticalreception path 32 a is folded on one side of the object 14. The otheroptical reception path 32 b is deflected by means of a deflectionelement 30 c from a perpendicular extent on the upper side of the object14 into the horizontal corresponding to the alignment of the camera 10.

Part fields of vision 18 a-b are thereby produced on the surface and ona side surface of the object 14 so that two sides of the object 14 aredetectable at the same time. The part fields of vision 18 a-b in FIG. 1are linear for a successive line-wise detection of the object 14 in thecourse of the conveying movement; with a matrix sensor as the imagesensor 24, correspondingly wider part vision fields are produced.

Different pixel regions or image segments are also produced on the imagesensor 24 due to the division of the field of vision 28 into part fieldsof vision 18 a-b. With a line sensor, these image segments arepreferably simply disposed next to one another. Accordingly part zonesof the reading field not required for the central part of the detectionand optionally also their illumination are decoupled and are used forthe detection of an additional side by deflections or folding. With amatrix sensor, part fields of vision 18 a-b can likewise be arrangednext to one another, but also stripwise above one another on the imagesensor 24.

An optional active illumination of the camera 10 not shown in FIG. 1 canlikewise be folded via the deflection elements 30 a-c as an illuminationcoaxial to the image sensor 24. A central illumination at the locationof the camera or integrated therein is thus sufficient and therespective part fields of vision 18 a-b are illuminated thereby.

The recorded images can be prepared in the evaluation unit 26 or in adownstream image processing using parameters adapted to the part fieldsof vision 18 a-b. Equally, parameters of the image sensor 24 or of theillumination can be set or regulated sectionally. The contrast orbrightness is thereby adapted, for example. A beam-shaping or opticalfiltering, in particular by a corresponding coating, by the deflectionelements 30 a-c is also conceivable.

FIG. 2 shows the camera device in accordance with FIG. 1 again in athree-dimensional view. FIGS. 3 and 4 are additionally an associatedfront view in the conveying direction and a plan view. The camera 10 isaligned horizontally or in parallel with the conveyor belt and isalternatively also aligned against the conveying direction. A lateraloptical reception path 32 a is guided or folded laterally via an upperdeflection element 30 a at the left side, first to the bottom next tothe conveyor belt 12 and then via a lower deflection element 30 b at theleft side in as perpendicular a manner as possible onto the side surfaceof the object 14. The lateral optical reception path 32 a corresponds tothe part field of vision 18 a not separately designated in FIG. 2 forreasons of clarity. The upper deflection element 30 a at the left sideon its own, that is without a lower deflection element at the left side,could already alternatively deflect to the side surface, but then withan oblique and no longer perpendicular optical path. A central opticalreception path 32 b is deflected downwardly to the upper side of theobject 14 at a central deflection element 30 c. The central opticalreception path 32 b corresponds to the part field of vision 18 b nolonger separately designated here.

Thanks to the deflection elements 30 a-c and the correspondingly foldedoptical reception path 32 a-b, the upper side and the left side of theobject 14 can be simultaneously detected from two different perspectivesby the camera 10. It is understood that this would alternatively equallybe able to be transferred to the right side. The detection of two sidesis anyway admittedly particularly advantageous for the case of a firstperspective from the side and of a second perspective from above, but adetection of two other sides or surfaces of the object 14 or twodifferent perspectives than from above and from the side would beequally conceivable.

FIG. 5 again shows the representation of FIG. 2 as a background anddivides the optical reception paths 32 a-b therein into theirstraight-line part sections A-E. The camera 10 with its reception optics22 only has a limited depth of field range. It is therefore particularlyadvantageous if the light paths are of equal lengths for the differentperspectives. Respective focused images are thereby recorded of thesimultaneously detected sides of the object 14. Differences in the lightpath lengths, particularly when they go beyond the tolerance that afinite depth of field range permits, would in contrast produce blur inthe recording of at least one side or surface. The same length of theoptical reception paths 32 a-b can be ensured by a skillful arrangementof the deflection elements 30 a-c, that is the equation A+b=C+D+E couldspecifically be satisfied. For this purpose, the central deflectionelement 30 c is arranged further away from the camera 10 with respect tothe upper deflection element 30 a at the left side so that A and B areextended, and indeed by just so much as corresponds to the diversion bythe double deflection onto the side surface having the sections C, D, E.It must be repeated that approximate identity within the framework ofthe depth of field range is sufficient.

The camera 10 can have an adjustable focus or an autofocus instead of afixed focus. However, this alone does not solve the problem of blur fromdifferent perspectives since the depth of field range can thus only beadapted for one perspective. Another option of solving the focusingproblem is a combination with the teaching of EP 2 937 810 A1 named inthe introduction. In this respect, deflection elements 30 a-c aresuitably replaced with staggered deflection elements at differentdistances. The recorded image sections multiply in accordance with thestaggering and a respective image section is localized and furtherprocessed that has been recorded with a suitably long light path in thedepth of field range.

FIG. 6 shows a further embodiment of the camera device in athree-dimensional view, with FIGS. 7 and 8 as a supplementary associatedfront view in the conveying direction or as a plan view. Unlike theembodiment in accordance with FIGS. 2 to 6, the other side of the object14 is now also detected from an additional third perspective. The abovestatements apply analogously with respect to the different embodimentoptions and in particular the configuration of the light paths for arespective recording in the depth of field range. This also inparticular applies to a configuration with equally long light pathscorresponding to FIG. 5, i.e. the detection of the other side of theobject 14 should likewise preferably take place with a light path ofequal length.

To provide a third perspective and to also still detect the second sideof the object 14, at the right here observed in the conveying direction16, an additional decoupling of a further lateral optical reception path32 c takes place laterally via an upper deflection element 30 d at theright side, first downward next to the conveyor belt 12 and then via alower deflection element 30 a at the right side in as perpendicular amanner as possible to the other side surface of the object 14. Thefurther lateral optical reception path 32 c corresponds to an additionalpart field of vision 18 c only designated in FIG. 7 for reasons ofclarity. Two part fields of vision 18 a, 18 c are now thereforedecoupled at both sides of the central part field of vision 18 b. Thanksto the deflection elements 30 a-e and the correspondingly folded opticalreception paths 32 a-c, the upper side, the left side, and the rightside of the object 14 can be simultaneously detected from threedifferent perspectives by the camera 10. Instead of a detection fromabove and from both sides, three other perspectives of a differentcombination of sides of the object 14 would be conceivable.

If the deflection does not take place in a perpendicular manner on thelateral surfaces, as previously described, but rather within thehorizontal plane at a 45° angle, that is, so-to-say on a perpendicularedge of an object 14 imagined as parallelepiped-shaped, the frontsurface or back surface can also be detected after one another in thecourse of the conveying movement with the respective side. In theembodiment in accordance with FIGS. 2 to 5, a decision would have to bemade on the front surface or the rear surface or to cover therespectively not detected surface via the perspective from above by acorresponding tilting. In the embodiment in accordance with FIGS. 6 to8, the one side can be detected at the front surface and the other sideat the rear surface. However, the disadvantage of a no longerperpendicular perspective on the respective object surface has to beaccepted for this purpose.

1. A camera device for detecting an object in a stream of objects movedin a longitudinal direction relative to the camera device, wherein thecamera device comprises a camera having an image sensor for recordingimages of the objects and at least one first deflection element, whereinthe field of view of the camera has at least one first part field ofvision with detection of the first deflection element and a second partfield of vision without detection of the first deflection element, andwherein the first deflection element is arranged such that a firstperspective of the first part field of vision is a different one than asecond perspective of the second part field of vision; the first partfield of vision thus provides a different perspective of the object thanthe first part field of vision so that at least two sides of the objectare simultaneously recorded by the image sensor.
 2. The camera device inaccordance with claim 1, wherein the second perspective is a plan view.3. The camera device in accordance with claim 1, wherein the firstperspective is a side view from the transverse direction transverse tothe longitudinal direction.
 4. The camera device in accordance withclaim 1, that comprises a second deflection element, wherein the fieldof view of the camera has a third part field of vision with detection ofthe second deflection element and the second deflection element isarranged such that a third perspective of the third part field of visionis a different one than the first perspective and the second perspectiveso that three sides of the object are simultaneously recorded by theimage sensor.
 5. The camera device in accordance with claim 4, whereinthe third perspective is a side view from an opposite direction from thefirst perspective.
 6. The camera device in accordance with claim 1,wherein the camera is installed as stationary at a conveying devicewhich conveys the stream of objects in the longitudinal direction. 7.The camera device in accordance with claim 1, that has a thirddeflection element that is arranged such that it is detected in thesecond part field of vision.
 8. The camera device in accordance withclaim 1, that has a fourth deflection element that once again folds theoptical reception path of the first perspective folded by the firstdeflection element.
 9. The camera device in accordance with claim 4,that has a fifth deflection element that once again folds the opticalreception path of the third perspective folded by the second deflectionelement.
 10. The camera device in accordance with claim 1, wherein thedeflection elements are arranged such that the light paths between thecamera and the object are of the same length for the differentperspectives with a tolerance corresponding to a depth of field range ofthe camera.
 11. The camera device in accordance with claim 1, whereinthe deflection elements have a mirror and a holder for installation in aspecified arrangement and orientation with respect to the stream ofobjects.
 12. The camera device in accordance with claim 1, wherein theimage sensor is configured as a line sensor.
 13. The camera device inaccordance with claim 1, wherein pixel regions of the image sensordisposed next to one another correspond to the part fields of vision.14. The camera device in accordance with claim 13, wherein a centralpixel region corresponds to the second part field of vision and alateral pixel region corresponds to further part fields of vision. 15.The camera device in accordance with claim 1, wherein pixel regions ofthe image sensor disposed above one another correspond to the partfields of vision.
 16. The camera device in accordance with claim 1, thathas an illumination unit to illuminate the field of view of the camera,in particular the part fields of vision via the respective deflectionelements.
 17. The camera device in accordance with claim 1, that has acontrol and evaluation unit that is configured to localize code regionsin the image data detected by the image sensor and to read their codecontent.
 18. A method of detecting an object in a stream of objectsmoved in a longitudinal direction, wherein images of the object arerecorded in a field of view and the field of view has a first part fieldof vision with detection of a first deflection element and a second partfield of vision without detection of the first deflection element, andwherein the first deflection element is arranged such that a firstperspective of the first part field of vision is a different one than asecond perspective of the second part field of vision; the first partfield of vision thus provides a different perspective of the object thanthe second part field of vision so that at least two sides of the objectare simultaneously recorded by the image sensor.